mydomain.net. 3600 IN A 216.239.32.21
mydomain.net. 3600 IN A 216.239.34.21
mydomain.net. 3600 IN A 216.239.36.21
mydomain.net. 3600 IN A 216.239.38.21
www.mydomain.net. 3600 IN CNAME ghs.google.com.
---
ghs.google.com. 282206 IN CNAME ghs.l.google.com.
ghs.l.google.com. 300 IN A 74.125.43.121

What we see here is that the Start Page service in Google Apps is apparently enabled, and published to "www.mydomain.net". In this case, you're going to first have to disable Start Page. If you don't, you're going to see another old friend